Hermetically sealed carton and method of sealing the same



Nov. 13, 1934 s. BERGSTEIN HERMETICALLY SEA-LED CARTON AND METHOD OF SEALING THE SAME Filed Sept. 12. 1932 3 SheetsSheet l ATTORNEYS 1934- S. BERGSTEIN 1,980,180

HERMETICALLY SEALED CARTON AND METHOD OF SEALING THE SAME Filed Sept. 12. 1932 3 Sheets-Sheet 2 ATTORNEYS s. BERGSTEIN 1,980,180

HERMETICALLY SEALED CARTON AND METHOD OF SEALING THE SAME Nov. 13, 1934.

Filed Sept. 12, 1952 3 Sheets-Sheet 3 INVENTOR ATTORNEYS,

Patented Nov. 13, 1934 PATENT OFFICE HERMETICALLY SEALED CARTON AND METHOD OF SEALING THE SALE 1 Samuel Bemtein, Cincinnati, Ohio Application September 12, 1932, Serial No. 632,773

Claims.

My invention relates to the methods of sealing the seams and wall junctures of paper cartons to render them impervious to seepage of oily or fatty material contained within the carton, so

' that the exterior of the carton will not be discolored by the wicking, seepage, or capillary action of material from within the carton along the seam or junctures of overlapping sealing portions of the carton or through the fibers of such over- 10 lapping portions.

In the use of paper cartons for oily and fatty materials, it is necessary to glaze or saturate the inner surfaces of the cartons with a coating of material that will make the carton impervious tothe oily and fatty materials contained in the contents of the carton. One method which is .Old is to provide a secondary inner container, such as a bag or other wrapping. Such a container is costly and not always practicable, as materials,

such as salted peanuts, potato chips and the like, have the oily material contained therein absorbed by the inner liner.

It is an object of my invention to provide a carton the inner surface of which is impregnated with moisture and grease proof materials in which the carton is so sealed that no edges or overlapping flaps of the carton will permit the seepage or capillary action or osmosis of oils or greases from the materials to the outside of the carton.

Ordinarily the inner surface of the carton is treated with moisture proofing material. The outer surface is not, and as most cartons are formed by joining at a corner edge overlapping portions, the juncture usually has a non-moisture proofed outer surface laid under a moisture proofed inner surface. Capillary action or osmosis causes seepage along the ncn-moisture proofed surface.

To explain my invention, reference may be had to the action of blotting paper in water. It is well known that if the lower end of a blotter be dipped in water soon the water will seep throughout the entire blotter structure. of the blotter were coated or glazed, the seepage would still occur. It is the seepage action through the inner edge of the innermost joint flaps which my invention seeks to,.eliminate.

Another object of my invention is to provide a carton with surfaces impregnated with mate- 0 rials that will make it impervious to oily and fatty material in which a cut or scored line adjacent the edge of an inner sealing flap will be saturated with a sealing material impervious to oils and greases so that when said flap is pasted r to the inner surface of the carton the cut or If the surfaces.

scored line will prevent the wicking or capillary. action of the oils and greases along the exposed edges of the carton.

Another object of my invention is to provide a method for applying sealing material to the cut and scored flap continuously while the flap is bent along the cut or scored line, and also for applying an excess of the material in the cut so as to saturate the edges of the cut and make the board at that point impervious to grease and oil saturation.

For carrying out my invention I provide mechanical means for applying oil-proof material usually the adhesive for sealing to cartons comprising a flanged disc with a groove at the corner between the vertical side of the flange and the peripheral surface of the disc, guide rails positioned to break the flap of a carton along a cut score so that the adhesive can be applied by the flange, peripheral surface and the groove of the disc simultaneously while the carton is passing through a machine for folding'the carton.

I also provide means for regulating the amount of adhesive to be applied to the surface of the flap and for regulating the size of the excess ridge or bead applied in the cut provided adjacent the edge of the carton. I further provide means for flattening the bent flap before pasting it to the other surfaces of the carton so that any excess of oil-proof material will be squeezed from between the cut and scored portion, but leaving sufilcient along the edges of the cut to make the flap impervious to the wicking or capillary action of oils on the materials contained in the carton. I further provide means for folding the cartom and pasting the sealing flap so that a carton with oil-proof edges or seams will result.

Objects other than those above mentioned will be more specifically pointed out in the specification and the drawings illustrating a preferred embodiment of my invention.

In the drawings:-

Figure 1 is a plan view of the carton blank.

Figure 2 is a fragmentary section along the line 22 of Figure 1 enlarged so as to emphasize the cut score.

Figure 3 is an elevation of the adhesive applying mechanism.

Figure 4 is an elevation of the adhesive applying mechanism with part in section taken on the line 4-4 of Figure 3.

Figure 5 is a fragmentary top plan of the adhesive. applying disc together with blades for regulating the thickness of adhesive on the sur- 110 faces of the disc.

Figure 6 is an elevation of a typical carton folding machine. I

Figure '7 is a perspective of a turn-over plate. .Figure 8 is a perspective of a completed box showing a secondary bottomin place.

Figure 9 is a perspective of a carton blank showing the flap bent up along the cut and score and the adhesive applied thereto.

Figure is a perspective showing a carton 10 blank with the side turned over preparatory to flattening out the flap.

Figure 11 is a perspective of a. carton after pasting the flap to one of the inner surfaces.

. Figure 12 is a perspective of the secondary bottom piece. Figure 6 illustrates in a general manner the usual type of carton folding-machine which comprises a supporting frame 1 and legs 2. At one end of the machine a'hopper 3 for carton blanks is positioned so that the cartons can be fed to a conveyor system of endless belts or chains 4 that are driven continuously by the sprockets 5.

Positioned at a certain point along the travel of the cartons is a series of turn-over plates 6 having flat horizontal portions 7 which gradually twist into vertical position at the ends 8. In the case illustrated, there are two of these turn-over plates 9 and 9a spaced so as to permit a carton end to pass between them. These turn-over 30 plates are positioned just ahead of'adhesive applying mechanism.

The adhesive applying mechanism comprises an adhesive tank 10 upon which are mounted bearings 11 for a shaft 12 which is rotatably mounted in the bearings. Mounted on the shaft there is a disc 13 with hubs 14 and 14a which keep it from lateral movement across the adhesive tank. The disc has a flange portion 15 and an offset peripheral surface portion 16. In 40 the corner between the vertical side of the flange portion and the peripheral surface there is a groove 17. This disc may be driven by gears or chain and can also be driven by contact with the carton being drawn through the machine by the conveyor chain.

Brackets '18 are fixed to the adhesive tank and adjustably support a series of scraper blades 19. Each of these blades has a series of slots for screws 21 which hold them in a set position. Each 50 of the blades is individual with respect to each other and to the surface ofthe disc they are to contact, as may beseen from Figure 5. The blade 19 contacts with the inner surface 19a of the disc. I

Blade 19c contacts with the peripheral surface 16 of the disc in addition to theinner surface 19d of the flange surface of the disc. Blade 19c contacts with and scrapes the the outer peripheral surface 19! of the flange, and blade 19g contacts the surface 19b of the disc, and by this arrangement of the blades, the thickness of adhesive to be applied is regulated to give variable amounts of adhesive to be applied by any particular surface.

The carton blank, after receiving the adhesive, is conveyed to the next series of turn-over plates 22, where the sides are folded over and the fiap pasted to a particular inner surface of the carton. The blank used in my process consists of the usual blank 23, with score lines 23a that define the back, sides, front, bottom and top of a box. The essential part of my blank is the flap portion 24 which has a cut score 25 spaced adjacent to the outer edge 25a of this flap. The depth of this cut score may be varied, but should preferably be substantially one-half the thickness of the board used. When adhesive is applied to the blank the flap will be bent up along the cut score as can be seen by referring to Figure 4. The portion 25b will be in a vertical position, and adhesive will be applied to the portion 26. The other portion 26a of the flap will contact the outer periphery of the disc and receive its adhesive; Simultaneous with the application of adhesive to these surfaces, the groove will deposit a ridge of adhesive 28 over and along the cut score. By applying the adhesive in this fashion the edges 29 and 30 of the cut score will be saturated with adhesive andform a barrier to the capillary action of any grease or oils on the materials contained within-the carton.

Referring to Figure 9, a blank is shown with part of the flapturned upward on the cut score, and also the ridge 28 of adhesive applied to-this cut score. When the side 31 is flattened out as shown in Figure 10, theexcess adhesive in the cut score will be forced from between the edges,

' leaving enough between the edges to be absorbed by the board and form the barrier as previously stated. When the carton is again folded over for final pasting in the condition shown in Figure '12, pressure is applied to the outer surface 32 so as to force it into contact with the ridge of adhesive on the flap. When this pressure is applied the adhesive will be evenly distributed and produce a firmly pasted seam.

In order to seal the edges 33 of the bottom flaps 34 of a box, I provide a secondary bottom piece 35 which is coated with material impervious to grease or oil. This bottom piece will be of such size as to snugly fit within the box at the bottom 36, as shown in Figure 8. From this last mentioned Figure 8, it can readily be seen that none of the material can come in contact with unthrough the fibers of said unglazed overlapping portion. I

2. A carton blank cut and scored to form a box having a wall flap within said box engaging an adjacent flap, a coating on the irmer sides of said box rendering them impervious to oils and grease saturation, and means forming a substantial barrier between fibres of the flap adjacent to an exposed inner edge of said wall flap to-inhibit the wicking action of oils and grea'ses'through the 4. The method of sealing edges of a sealing flap of a surface coated grease-proof carton blank, which consists in interposing, a barrier of greaseproof materials between fibers of the flap parallel and adjacent an exposed inner edge of said flap, thereby inhibiting the capillary action of oils and greases through the material of said blank beneath the surface coating 01' said blank.

5. A carton formed from a folded blank with the inner surface of the blank impregnated with grease-proof materials and having an interlorly overlapping sealing flap, a cut adjacent the exposed edges of said carton saturated with greaseproot material forming a barrier that prevents t the passage of oils and through the board stock to enclose the material therein as a barrier to seepage through the fibers oi the stock.

8. A carton having a sealing flap in which there is a cut partially through thevcarton stock, with grease-proofing material enclosed in the cut, iorming a barrier to seepage through the fibers of the stock.

9. The method of sealing the edge 0! a sealing flap of a carton to prevent seepage through the fibers which consists in forcing a grease-proof material between fibers oi the carton stock in a closely restricted area along a line following the direction of said edge of the flap.

10. A carton having a sealing flap with greaseproof material containedto a substantial amount in its fibers within a closely restricted area along a line following the direction of an edge of the flap that is exposed when the carton is sealed, to

form a barrier against seepage through the fibers v of the flap. v

SAMUEL BERGS'I'EIN.

terial in the opened cut, and then bending the 

